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Research Papers

Experimental Investigation of Conjugate Heat Transfer in a Rib-Roughened Trailing Edge Channel With Crossing Jets

[+] Author and Article Information
Filippo Coletti

Department of Turbomachinery and Propulsion, von Karman Institute for Fluid Dynamics, 1640 Rhode-St-Genèse, Belgiumcoletti@vki.ac.be

Manfredi Scialanga

Department of Turbomachinery and Propulsion, von Karman Institute for Fluid Dynamics, 1640 Rhode-St-Genèse, Belgiumscialanga@vki.ac.be

Tony Arts

Department of Turbomachinery and Propulsion, von Karman Institute for Fluid Dynamics, 1640 Rhode-St-Genèse, Belgiumarts@vki.ac.be

J. Turbomach 134(4), 041016 (Jul 21, 2011) (11 pages) doi:10.1115/1.4003727 History: Received December 01, 2010; Revised February 11, 2011; Published July 21, 2011; Online July 21, 2011

The present contribution is devoted to the experimental study of the conjugate heat transfer in a turbine blade cooling cavity located near the trailing edge. The cooling scheme is characterized by a trapezoidal cross-section, one rib-roughened wall, and slots along two opposite walls. The Reynolds number, defined at the inlet of the test section, is set at 67,500 for all the experiments. The values of all the important nondimensional parameters characterizing the experiment, including the solid-to-fluid conductivity ratio, are engine-representative. Uniform heat flux is imposed along the outer side of the rib-roughened wall. The measurements are performed using three different ribbed walls, with thermal conductivities ranging from 1Wm1K1 to 18Wm1K1. Highly resolved distributions of nondimensional temperature and Nusselt number over the rib-roughened wall are obtained by means of infrared thermography and finite element analysis. The impact of the conduction through the wall on the thermal performance is demonstrated by comparison with purely convective results, previously published by the authors on the same configuration.

Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Major physical variables in steady state conjugate heat transfer (channel flow)

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Figure 2

Temperature variation of thermal conductivity ratio for Nimonic-air coupling (values of k for Nimonic from Ref. 38)

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Figure 3

Test section (top) and view of the investigated area (bottom) highlighting midwall slots, inclined ribs, and exit slots

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Figure 4

2D FEM analysis: comparison between full conductive and heated configuration (top) and configuration where only the ribbed wall is conductive and heated (bottom). Not to scale.

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Figure 5

Experimental setup

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Figure 6

Infrared thermography scheme (not to scale)

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Figure 7

Numerical domain: thermal boundary conditions (top) and particular of the mesh (bottom)

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Figure 8

Mean flow model in the main cavity (27)

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Figure 9

Nondimensional temperature distribution. From top to bottom: stainless steel, Inconel, and ceramoplastic.

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Figure 10

Profile of nondimensional temperature along the rib tip at a distance of 0.3e from the impingement side

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Figure 11

Nondimensional temperature difference: pseudoconvective case versus conjugate case

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Figure 12

Section of the ribbed domain: normalized nondimensional temperature (contours) and heat flux (streamlines). From top to bottom: stainless steel, Inconel, and ceramoplastic.

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Figure 13

Section of the ribbed domain: contours of normalized nondimensional temperature. From top to bottom: stainless steel, Inconel, and ceramoplastic (refer to axes in Fig. 8).

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Figure 14

Nusselt number distribution. From top to bottom: stainless steel, Inconel, ceramoplastic, and convective.

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Figure 15

Nusselt number difference: convective case versus conjugate case

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Figure 16

Area-avereged Nusselt number for the various investigated surfaces and wall materials

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Figure 17

Relative heat flux extracted from the various investigated surfaces and wall materials

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